Soot and sifting ejector for boilers



April 10, 1928.

C. L. DAVIDSON SOOT AND SIFTING EJECTOR FOR BOILERS Filed Dec, 50. 19222 Sheets-She. 1

INVENTOR BY ATTORNEY S April 10, 1928.

C. L. DAVIDSON SOOT AND SIFTING EJECTOR FOR BOILERS GOQQQOOOGZ FiledDec. 50. 1922 r-l 2 Sheets-Sheet 2- (MML INVENTOR more fullyhereinafter. -v 5;;

The invention consists substantiallj in the Patented Apr. 10,1928.

UNITED srAres GHABLESL. DAVIDSON, OF YORK, 1LT.

soor aim srr'rrnc EJ'EGTOR FOR BoILEns.

Application filed December 30, 1922. Serial No. 609,799.

This invention relates to means for eject-= mg-dirt, ash, siftings,etc., from boilers, or from the casings of oiler furnaces.

means which are simple and efficient for ejecting accumulations of soot,ash, siftings, dirt, etc, which'collect in furnace chambers.

A further object of the invention is to provide an ejecting mechanism ofthe nature and character referred to which is simple and efficient inoperation, and is controllable to accomplish the removal of deposits oraccumulations of soot, dust, dirt, siftings, ashes, and the like,throughout a consider able area. Other objects of'the invention will,app 7 construction, combination, location, and relative arrangement ofparts, all as will be more fully hereinafter set forth, as shown in theaccompanying drawings, and finally pointed out in the appended claims.Referring to the accompanying drawings: Fig. 1 is a view partly inelevation, partly in section, showing one type of boiler setting andfurnace chamber, and theapplication thereto of an ejecting mechanism,embodying the principles of my invention.

Fig. 2 is a view in elevation, parts broken out, and parts broken off,and in section, "or

an ejector mechanism embodying my inven-- tion.

Fig. 3 is a plan view of a ejecting mechanism.

Fig. 4 is a broken view in longitudinal section of the 1 ortion ofejecting mechanism shown in ig. 3. I

Fig. 5 is a view in transverse section on line 5, 5, Fig. 2, looking inthe direction of the arrows.

Fig. 6 is a view similar to Fi 5 on theline 6, 6, Fig. 2, looking-in theirection of portion of the the arrows.

Fig. 7 is abroken detail view in elevation of means for controlling theejecting mecbamsm.

Fig. 8 is a top plan view of the same.

Fig. 9 is a view similar to Fig. 3 showing a slightly modifiedarrangement embodying my invention.

The same part is designated by the same reference numeral wherever itoccurs throughout the several views.

In the use of boilers, accumulations of soot, unburned particles ofcarbon, and other products of unconsumed fuel, collect, or are depositedupon the boiler tubes, and other I portions of the interior surface ofthe fur- The ob ect of the invention is to provide nacechamber, firewalls," etc. Various-devices have been employedfor the purpose ofremoving these deposits and accumulations.

been proposed and used for the pur ose of detaching the accumulationsfrom. t e surfaces of the tubes. In the use of such dee vices theaccumulations which are removed from the boiler tubesand other surfacesof the setting become deposited usually at the rear of the boiler,gradually building up a -soot bed around the rear ends of the tubes,

which inetime clogs the draft of the furnace. Such accumulated de ositshave necessitated in most" types of oiler furnaces access to the rear ofthe boiler tubes to enable the "bed' of accumulated material to be-,scraped out and removed from the tube approximately from 5,000 to13,000 B. t. u.

per pound; The loss and waste of this heat value becomes an importantitem of fuel economy. It is among the special purposes of my presentinvention to provide an ejector mechanism which is simple in structure,eflicient in operation, andwhich is readily and easily ap lied to any ofthe modern types of steam oiler furnaces for ejecting the accumulationsof deposited or detached soot and other unburned particles of fuel,siftings, and theli ke, from their point of accumulation, and deliveringthe same into the firebed for consumption and utilization of their heatvalues.

In my pendin application, Serial No. 332,270, filed Octo er 21, 1919-, Ihave shown, described and claimed a structure of ejector mechanismdirected towards the objects and purposes above noted, but in saidstructure theejecting application or operation is localized at certainpoints, only of the system. It is among the spec al purposes of presentinvention to provlde an apparatus-which is controllable and progressivein its action throughout the entire area or space in which the depositsand accumulations take place.

In accordance with my resent mvention,

inc

I propose to dispose within the area where such accumulations of. soot,unburned particles of fuel, and the like, collect, tubular members'telescoped the one over the other, and relatively revoluble withrespect to each other, and having openings which are brought intoregister with each other successively and progressively from end to endof the telescoping members as said members are rotatively moved withrespect to each other. By imposing an ejecting force within said tubularmembers, either vacuum or ressure, and within a delivery connection terefrom, I am enabled to quickly and eificiently and progressively ejectsuch accumulationsthroughout the entire area or space controlled by themechanism. Through the delivery connection from the tubular members theaccumulations are delivered into the fire chamber of the boiler furnacewhere they may be again ignited and the heat values thereof utilized.

In the drawings I have shown various structures embodying'the principlesofi my invention. Referring particularly to Fig. 1, 10 designates theboiler tubes of a boiler furnace, which may be arrangedwithin the boilersetting in any suitable, convenient, or

well known manner, and in proper relation to the fire chamber 11,according to well known types of boiler furnaces. In the type shown, theboiler tubes 10 are disposed at a downward inclination through and fromthe furnace chamber 11. In the operation of a boiler furnace of this tye" soot and other unburned. particles of fue accumulate within thechamber orspace 12 outsideof the 'fire wall 13 of the boiler setting andbeneath the lower ends of the boiler tubes. Such accumulations of sootand other deposits occur in this chamber or space 12 either from theaction of the natural or forced draft, or

' from the action of steam or air jets applied to remove deposits ofsoot and the like from the boiler tubes, or from mechanical scrapingdevices sometimes employed for this purpose.

' Within this chamber 12'Iarrange an ejeceating with the tor devicehaving a deliver connection 14 delivering as at 15 into the urnacechamber 11. Cooperating with the delivery connection 14 is a pipeconnection 16 for delivery of air, steam, or other ejecting power force,

in the operation of which an ejecting action .in one of the tublarmembers in a straigfit line parallel with the axis of said member, andthe opening or openings in the other of the tubular members 1n aspiralextending from end to end of said. member, it will be seen that the.openingsin the two tubular members are'brought into register with eachother progessively from end to end as the one or the other of thetubular members is axially rotated. It is immaterial in which member thespiral opening or openings 1s may be employed without departure from thespirit and scope of my invention, for example, in Fig. 9 I have shownthe outer tubular member formed with a straight slot or opening 21extending from end to end thereof, while the inner tubular member isformed with a successive series of straight slots 22, arranged instaggered or successively ofl'set relation with respect to each other.

When a suction force is applied to the bores of the telescoping tubularmembers, it will be seen that any soot or accumulation lying adjacent toany registering openings 19, 20, or 21, 22, will be drawn into the boreof the tubes and through the discharge connection 14 and deliveredthrough the portion 15 into the furnace chamber, such ejection-and de-IOU livery action being localized at the point where the openings 19,20, register with each other. Now, by rotatively moving one of thetubular members,'thispoint of localization of the suction action willpro ress from end to end of the telescoping tubes as the rotativemovement continues to bring successive portions or openings of the twotubes into register with each other. Asshown in Figs. 2 and 5, theregister of the openings in the two tubular members occurs atapproximately the midlength of the tubes. Now, by reason of the spiralarrangement and relation of the opening or openings in one of the tubes,in this case, the outer-tube, the rotation of said tube causes the pointof register, and hence of the localization of the ejecting action, toprogress towards one end or the other. of the tubes accordin .to thedirection of rotation imparted'to t e tube. From the foregoingdescription it will be seen that I am enabled to secure a wide range ofejecting action, in fact, substantially throughout the area or spacewithin which accumulations and deposits ordinarily occur.

The tubular members 17, 18, or one of them, maybe rotatively actuated inany suitable or convenient manner, to control mamas the range ofejecting action secured from apoint outside the setting of the boiler.In Figs. 2, 7 and 8 I haveshown one arrangement wherein a worm wheel 23is mounted upon the end of the tubular member 17-. With this worm wheelmeshes a worm gear 24 carried by a shaft 25,-which may be easily rotatedby hand. The shaft 25 is journaled within a suitable bracket 26 mountedupon the end of the casin 27 within which the end of the tube 17 is1ournaled.

In Figs. 1 and 9 I have shown a ratchet wheel 28 mounted upon the outertubular member arranged to be engaged by a pawl 29 carried by a handlever 30 pivotally mounted upon "the journal casin 27. Of course, itwill be understood t at other forms of. rotating mechanism may beemployed for rotatively actuating one or the other of the tubes Thearrangements shown, however, are simple and efficient and economical toconstruct, install and maintain. By reference to Fig. 1, it will be seenthat the means for rotatively actuating the tubular member are. locatedoutside of the boiler furnace setting, and hence in convenient positionfor proper and suitable manipulation. It is obvious that an ejectinmechanism of the nature referred to may he employed in connection withany standard type. of boiler furnace and may be used in connection withany method or form employed for dislodging the accumulations of soot andother deposits from boiler tubes and is equally effective for use whereno special means are employed for the removal of accumulations of sootdeposits from the tubes.

Of course it will be understood that the worm gear structure forrotating one of the tubular members is employed where the end of thetubular member is not conveniently accessible. Where such accessibilityexists the simpler and more economical pawl and ratchet arrangementwould be preferable.

2. A boiler furnace having a fire chamber and a soot collecting chamber,in combination with a suction device disposed in the sootcollectingchamber and delivering into the fire chamber, said suctiondevice having openings along a portion of its length, means to create asuction in said suction device, and means to progressively uncover andsuccessively cover the openings in the suction device.

3. A boiler furnace having a fire chamber and a soot collecting,chamber, in combination with a hollow member disposed in said collectingchamber and having openings along its length, a delivery connection fromsaid member into the fire chamber, means to create an ejecting force insaid delivery connection and to produce a flow of gases into and throughsaid hollow member, and means to progressively uncover and successivelycover the openings along the length of said hollow member. I V

In testimony whereof I have hereunto set my hand on this 27th day ofDecember CHARLES L. DAVIDSON.

